Mixing machine



F. BEKEN MIXING MACHINE Oct. 12, 1937.

Filed May 15, 1936 UNITED STATES PATENT we IMIXING MACHINE Fritz Beken,Ilford, England Application May 15, 1936, Serial No. 79,976 In GreatBritain July 24, 1935 3 Claims.

This invention relates to mixing machines and has for its object toprovide an improved machine which will intimately mix various materialsin a shorter period of time than has hitherto been possible. Even ifhowever the mixing process is not materially hastened by the use of themachine according to this invention, a more perfect mixture is obtainedthan by other machines of the kind employing rotating beaters, paddlesor agitators mounted on two parallel horizontal shafts rotating atdifferent speeds to which the present invention relates.

The improved machine hereinafter described is particularly adapted formixing plastic materials but may be employed also for mixing granular orpowdered materials or even in mixing processes in which a liquid, suchas a chemical solution for example, is added to the material undertreatment.

A mixing machine of the kind aforesaid according to the presentinvention is characterized by the fact that the blades of the paddlesare so formed that the interengagement of the blades of the paddles onone shaft with the blades of the paddles on the other shaft presentopposed surfaces between which the material under treatment is pressed.

Preferably one paddle shaft is adapted to rotate at twice the speed ofthe other paddle shaft.

The nature of the invention will be however more clearly appreciated byreference to the accompanying drawing, illustrating by way of exampleone form of mixing machine embodying the invention, similar referencecharacters referring to like parts in both the figures:

Figure 1 being a sectional elevation and Figure 2 a plan view.

Referring to th drawing it will be seen that on the main frames orstandards a of the machine are mounted the mixer driving shaft 17 andthe two parallel horizontal paddle shafts c and d that respectivelycarry the paddles or beaters e and 7 so that they are rotated in theinterior of the stationary mixing pan 9 that contains the material undertreatment.

The blades of the paddles e and f in the example illustrated are ofcurved formation and are spirally disposed on their respective shafts cand d but the blades e' of two of the paddles on shaft care so set thatthey are at right angles to the remaining blades on the shaft that isthey are in a plane which is at right angles to the plane of the bladesof the other two paddles on shaft 0.

The blades may be flat or of any convenient length or width and of anynumber on either shaft and they may all be in the same plane. They mayhave their edges at an angle to the axes of the shafts.

On the driving shaft b, driven in any convenient manner as for exampleby belt drive to the fast and loose pulleys, h i, is mounted a spurwheel is that meshes with a larger spur wheel m on one end of the paddleshaft d. On the other end of the shaft 01 is mounted a spur wheel n thatmeshes with a smaller spur wheel mounted on the other paddle shaft 0.The gear wheels n and 0 are preferably in the ratio of two to one sothat the paddle shaft d rotates at twice the speed of the paddle shaft0.

The shafts c and d are disposed at such a distance apart that the bladesof the paddles e and interengage in the course of their rotation inopposite directions that is to say as the blades of the one shaftapproach the blades of the other they provide opposed surfaces betweenwhich the material is pressed and with the method of driving theinterengaging paddles ensures what may be termed a push-and-pull actionon the material under treatment. During one phase of the revolution themore rapidly rotating blades 1 overtake the blades e, that rotate athalf the speed of the blades 1, and the material is therefore pushed orsqueezed between the two sets of blades, and so is thoroughly kneadedand distributed throughout the whole mass. During the next phase of therevolution the blades 7 have padded the blades e and so exert a pullingaction nussutn JAN 131942 on the material, drawing it out or stretchingit,

which in conjunction with the kneading action of the former phase givesvery effective results more especially in the mixing of materials of aplastic nature.

What I claim is:--

1. A mixing machine including parallel shafts, blades mounted on therespective shafts, the blades on one shaft presenting less distancebetween their adjacent free ends than the similar distance of the bladeson the other shaft, and means for rotating one of the shafts at a speedin excess of the rotation of the other shaft, whereby to cause theblades on the shaft of increased speed to interfit between the blades onthe shaft of decreased speed and compel a pressing action of thematerial between the blades on the shaft of increased speed and theleading blade on the shaft of decreased speed and an immediatelysubsequent stretching of the material be.- tween the said blades.

2. A mixing machine including a container,

decreased speed to first compel a pressing action of the material andthen a stretching action of the material.

3. A mixing machine including a container,

spaced parallel shafts mounted for rotation therein, means for operatingthe shafts to drive one at double the speed of the other, blades indiametrically opposed relation on the shaft of increased speed, and setsof diametrically opposed blades on the shaft of decreased speed.

FRITZ BEKEN.

, CERTIFICATE 9F CORRECTION, V t Patent No. 2,095,907.. October 12,1957.

FRITZ BEKEN.

Itvis hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows Page 1second column, line 55 for the word "padded" read passed; and that thesaid Le tters Patent should be read with this correction therein thatthe same may conform to the'record of the case in the Patent Office.

Signed and sealed this 1st day of February A Do 1958.

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents.

